which way to go

I finished medical assistant program in 1999. I have not worked in this field since 2001. In order to work again I was told to retake the entire course over. Waste of time! So instead I want to know what to take to be at least a step higher than that of a m.a. I do love to draw blood,so I am interested in phlobotomy. The only problem is that I am a single parent of 4, that doesn't count on a lot of time and funds. Although, babysitting is available. I need advice. Can you help me? Please!